ES3, ES4 & ES6 Instructions. V1.06 Page 14 August / 2014
Fault nding
Repairs should only be carried out by competent persons familiar with electric instantaneous
water heaters.
All service work should be performed by an authorized Zip service engineer – for details of
the full range of services available call Zip Service on: 0845 6 005 005 / 0345 6 005 005.
When calling for service, please always specify the appliance model and serial number.
The following table will be helpful in determining the causes of some common problems and
their solutions
LED Functions
Green LED
Green LED ashing Standby mode
Green LED constantly on Appliance is heating water
Red LED
Red LED constantly on
The required outlet temperature cannot be
achieved at maximum power
Red LED ash code:
Long- short-long-short-long Heating element defective
Long-short-short-short Temperature sensor faulty
Long-short-long Air bubble in system
NOTE!
Maintenance work must only be carried out by a competent person familiar with instantaneous
water heaters.
Outlet ttings (jet regulator Fig. 5) should be unscrewed from the tap nozzle and cleaned at
regular intervals.
• Rinse the regulator with water and brush off the debris. For difcult to remove deposits,
soak in white vinegar (or a proprietary scale cleaner) for a few minutes and scrub with a
toothbrush.
• If any parts are cracked or broken, replace them. If the washer has hardened, it should be
replaced.
• With the debris cleaned out, screw the regulator back into the tap.
Hand tightening should be adequate.
The electrical and plumbing components should be inspected regularly by a competent
person to ensure proper functioning and operational safety.
Water quality should be considered when determining the frequency of inspection.
Each time the appliance is emptied (e.g. due to work on the plumbing system, if there is a risk of
freezing or in case of maintenance), the appliance must be purged by opening and closing the hot
water tap until all air has been eliminated from the water heater and no more air emerges before
re-connecting to the electrical supply.
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